The Study of the Fundamental Structure of Matter with a ......reqqg yuires high luminosity to be...

The Study of the Fundamental The Study of the Fundamental Structure of Matter with a future Structure of Matter with a future

ElectronElectron Ion ColliderIon ColliderElectronElectron--Ion ColliderIon Collider

On behalf of the EIC Collaboration

http://web.mit.edu/eicc

1Richard Milner MAMI and Beyond April 1 2009

• Introduction

• Scientific motivation

• AcceleratorC R&D- Concepts, R&D

D t t• Detector- Concepts, R&D

• RealizationPl f th f t- Plans for the near future

- Perspective on the longer term


The Fundamental Structure of MatterThe Fundamental Structure of MatterThe Fundamental Structure of MatterThe Fundamental Structure of Matter• Essentially all of theEssentially all of the

observable matter in the universeis made of protons and neutronsis made of protons and neutrons

• QCD describes these building blocks in terms of pointlike quarksblocks in terms of pointlike quarksand gluons.I h b j l f h i i d d• It has been a major goal of physicists to understand the structure and properties of the nucleon.R t k h b ht d t di t• Recent work has brought our understanding to a new level of precision.


Baryonic mass is dominated by QCDBaryonic mass is dominated by QCD

M (M V)Mass (MeV)

B. Müller, Nucl. Phys. A 750 (2005) 84

4

A 750 (2005) 84

Richard Milner MAMI and Beyond April 1 2009

QCD is uniqueQCD is uniqueqq• It is the only fully consistent theory that we are certain

that describes the real world: in the limit m →0 therethat describes the real world: in the limit mq→0, there are no free parameters

• All the interactions are a consequence of deep• All the interactions are a consequence of deep symmetry principles like gauge invariance and chiral symmetryy y

• Most of the visible phenomena are emergentquarks and gluons are not seenquarks and gluons are not seen

• This makes QCD the only laboratory for exploring the dynamics of a non-trivial consistent relativistic theorydynamics of a non trivial, consistent relativistic theory

• The `silent partners’ (gluons and sea quarks) of QCD are largely unexplored and poorly understood

5

are largely unexplored and poorly understoodRichard Milner MAMI and Beyond

April 1 2009

High Energy Lepton ScatteringHigh Energy Lepton Scattering

• Interpretable within a rigorous QCD framework • Directly probes quarks and gluonsy g• Virtual photon imparts energy and momentum to

quark in a completely controllable way 6Richard Milner MAMI and Beyond

April 1 2009

QCD remarkably successfulQCD remarkably successfulBjorken scaling PDF’sBjorken scaling

DGLAP evolutionPDF s

Sea quarksSea quarks

Running coupling αS


Scientific frontiersScientific frontiers

• Spin structure of nucleon- gp

1(x) at low x dramatic QCD prediction- gluon and sea quark polarization- Bjorken sum rule QCD test- new (GPD, transversity) parton distributions

• Partonic understanding of nuclei gluon momentum distribution in nuclei: essential to- gluon momentum distribution in nuclei: essential to understand hot QCD in RHI collisionsfundamental explanation of nuclear binding- fundamental explanation of nuclear binding

- saturation


Why a high luminosity leptonWhy a high luminosity lepton--ion collider ?ion collider ?

• The lepton probe provides the precision of the electroweak interaction but requires high luminosity to be effectiveq g y

• Lepton scattering on hadron targets in new regimes has consistently yielded new insights, e.g. DIS, EMC effect, Glue 10

000

• High Ecm ⇒ large range of x, Q2 Qmax2= ECM

2•xx range: valence, sea quarks, glue2

ep -> eX

Kinematic Range

0x

250

GeV

100

1000

Q^2

Q2 range: utilize evolution equations of QCD• High polarization of lepton, nucleon achievable

C l t f l t t

10

12 G

eV

Fixe

d Ta

rget

110

• Complete range of nuclear targets• Collider geometry allows complete reconstruction of the final state

EIC i d d t l t th t d f

0.0001 0.001 0.01 0.1 1.0

x

1

EIC is needed to complete the study of the fundamental structure of matter


EIC evolutionEIC evolution• Substantial international interest in high luminosity (~1033cm-2s-1)

polarized lepton-ion collider over more than a decade• WorkshopsWorkshops

Seeheim, Germany 1997 MIT, USA 2000IUCF, USA 1999 BNL, USA 2002BNL, USA 1999 JLab, USA 2004Yale, USA 2000 BNL,USA 2006

I l 2007 EIC C ll b ti f d• In early 2007 an EIC Collaboration was formedhttp://web.mit.edu/eicc

• Recent EICC meetings approx every six monthsRecent EICC meetings approx. every six months2007: MIT, Stony Brook 2008: Hampton, Berkeley 2009: GSI, Germany joint with ENC on May 28, 29, 30

• Over the last decade, EIC has become established as the leading candidate for the next QCD machine

• EIC viewed as part of the future at both BNL and JLab10

• EIC viewed as part of the future at both BNL and JLab.Richard Milner MAMI and Beyond

April 1 2009

EIC science has evolved from new EIC science has evolved from new insights and technical accomplishmentsinsights and technical accomplishmentsinsights and technical accomplishments insights and technical accomplishments

over the last decade over the last decade • ~1996 development of Generalized Parton Distributions• ~1999 high power energy recovery linac technology• ~1999 high-power energy recovery linac technology • ~2000 universal properties of strongly interacting glue • ~2000 emergence of transverse spin phenomenon• ~2000 emergence of transverse-spin phenomenon• ~2001 world’s first high energy polarized proton collider

2003 tantalizing hints of saturation• ~2003 tantalizing hints of saturation• ~2006 electron cooling for high-energy beams

Still many ongoing developments: constraints on gluon polarization, 1st

tests of crab cavities, development of semi-inclusive DIS framework at NLO 2nd round of deep exclusive measurements Lattice QCDNLO, 2nd round of deep exclusive measurements, Lattice QCD progress, etc., etc. 11Richard Milner MAMI and Beyond

April 1 2009

NSAC 2007 Long Range PlanNSAC 2007 Long Range Plan“An Electron Ion Collider (EIC) withAn Electron-Ion Collider (EIC) with polarized beams has been embraced by the U.S. nuclear science community as embodying the visioncommunity as embodying the vision for reaching the next QCD frontier. EIC would provide unique capabilities for the study of QCD well beyond th il bl t i ti f ilitithose available at existing facilities worldwide and complementary to those planned for the next generation of accelerators in Europe and Asia Inof accelerators in Europe and Asia. In support of this new direction:

We recommend the allocation of resources to develop acceleratorresources to develop accelerator and detector technology necessary to lay the foundation for a polarized Electron Ion Collider. The EIC would explore the new QCD frontier of strong color fields in nuclei and precisely image the gluons in the proton ”

12

gluons in the proton.


OverviewOverviewThe EIC will explore the most compelling issues in nuclear science and technology.

– The structure of visible matter– The role of gluons in hadronic matter– Fundamental symmetries of natureFundamental symmetries of nature

This will require a new generation of accelerator and detectors.


Goal of the ElectronGoal of the Electron--Ion Collider:Ion Collider:To explore the structure of visible matterTo explore the structure of visible matter

• What is the internal landscape of the hadron?– Benchmark: Spatial, spin, flavor and

gluonic structuregluonic structure• What is the nature of the nuclear force

that binds protons and neutrons into l i?nuclei?

– Frontier: QCD properties of nuclear force

– Mysteries: QCD effects in nuclei


Understanding the proton Understanding the proton iispin spin

A Th l t ib ti ll J N l Q k bit l A M ll15

A. Thomas: gluon contribution small J. Negele: Quark orbital A.M. smallRichard Milner MAMI and Beyond

April 1 2009

The Spin of the ProtonThe Spin of the ProtonNobel Prize, 1943: "for his contribution to the development of the molecular ray method and his discovery of the magnetic moment of the proton" y g pμp = 2.5 nuclear magnetons, ± 10% (1933)

Proton spins are used to image the structure and function of the

Otto Stern

p ghuman body using the technique of magnetic resonance imaging.

Paul C. Lauterbur

Sir Peter Mansfield

Nobel Prize, 2003: "for their discoveries concerning magnetic resonance imaging"Lauterbur Mansfield concerning magnetic resonance imaging"


Explore the structure of the nucleonExplore the structure of the nucleon• Parton distribution functions• Longitudinal and transverse spinLongitudinal and transverse spin

distribution functions• Generalized parton distributions•Transverse momentum distributions•Transverse momentum distributions

Lattice -> quantitative predictions


EIC will extend reach of spinEIC will extend reach of spin--dependent dependent inclusive measurements by several orders ofinclusive measurements by several orders ofinclusive measurements by several orders of inclusive measurements by several orders of magnitudemagnitude

A BruellA. BruellR. Ent

7 GeV e on 150 GeV p

18

7 GeV e on 150 GeV p5 fb-1 integrated luminosity Scaling violations directly

observed!Richard Milner MAMI and Beyond

April 1 2009

Low x inclusive polarized DIS Low x inclusive polarized DIS measurements constrainmeasurements constrain ΔΔg(x)g(x)measurements constrain measurements constrain ΔΔg(x)g(x)

7 GeV e on 150 GeV p5 fb-1 integrated gluminosity

A. BruellR. Ent


Light quark structure Light quark structure –– chiral propertieschiral propertiesg qg q p pp pTagged structure functions to reach x > 0.9RHIC-Spin region

Spectator forward tagging to minimizeSpectator forward tagging to minimize deuteron structure –similar requirementsas exclusive, DVCS, diffraction


Strange quark distributionsStrange quark distributionsHERMES data

• Asymmetric strange-antistrange sea can explain NuTeV anomaly • Data on same time scale as disconnected diagrams in lattice calculations.• What about charm quark contributions?

21

• What about charm quark contributions?Richard Milner MAMI and Beyond

April 1 2009

Test of Charge Symmetry ViolationTest of Charge Symmetry Violationg y yg y y

Charge symmetry < 1% A Thomas• Charge symmetry < 1%• u ≡ up = dn, d ≡ dp = un

A. Thomas

• e+ and e- beams can probe different flavor aspects of the nucleon• Neutral and charged current cross section measurements have been carried out at HERAbeen carried out at HERA• Polarized e+/e- beams can add additional capability


Generalized Parton DistributionsGeneralized Parton Distributions

Q2

Bjx~ξ

ξ+x ξ−x

t )(H ξ xx ≠

ξ+x ξx

f f t t ),,( txH ξBjx~ξBjxx ≠form factors

)(),,( 1 tFtxHdxe qq q =∫∑ ξ

PDFs )()0,0,(, xqxH gq =

)()0,0,(~ , xqxH gq Δ=…

GPD’s provide a 2D spatial image as a function of x


QQCCDD and the Origin of Massand the Origin of Mass

99% of the proton’s mass/energy is due to the selfmass/energy is due to the self-generating gluon field

– Higgs mechanism has– Higgs mechanism has almost no role.

The similarity of massThe similarity of mass between the proton and neutron arises from the fact that the gluon dynamics are the same

– Quarks contribute almost nothing.


Explore gluonExplore gluon--dominated matterdominated matter• What is the role of gluons and gluon self-interactions in nucleons

and nuclei? NSAC-2007– Gluon dominance in the protonp

Gl di t ib ti G( Q2)Gluon distribution G(x,Q2)• Scaling violation in F2: dF2/dlnQ2

• FL ~ as G(x,Q2) • inelastic vector meson production

(e.g. J/ψ)• diffractive vector meson productiondiffractive vector meson production

~ [G(x,Q2)]2

• …

EIC: most precise measure of gluon densities


Recent progress Recent progress –– direct Fdirect FLLmeasurements from HERAmeasurements from HERAmeasurements from HERAmeasurements from HERA

⎥⎤

⎢⎡

−⎟⎟⎞

⎜⎜⎛

+−=→

)()(14 22

2222

QxFyQxFyyd eXep πασ

⎥⎥⎦⎢

⎢⎣

−⎟⎟⎠

⎜⎜⎝

+−= ),(2

),(2

1 242 QxFQxFyxQdxdQ L

EIC – an FL factory

26

EIC an FL factory


Gluon Contribution to the Proton SpinGluon Contribution to the Proton Spin

Δg/

g

Projected data on Dg/g with anProjected data on Dg/g with an EIC, via g + p D0 + X

K- + p+

Advantage: measurements

RHIC-Spin

Advantage: measurements directly at fixed Q2 ~ 10 GeV2 scale!


Using Nuclei to Increase the Gluon DensityUsing Nuclei to Increase the Gluon Density1• Parton density at low x rises as

• Unitarity ⇒ saturation at some• In a nucleus there is a large enhancement of the parton

1xδ

2sQ

• In a nucleus, there is a large enhancement of the parton densities / unit area compared to a nucleon

2 1 13 3

2

//

A A AG R GA AG r A G

ππ

≈ ≈/

6 f o r 2 0 0N N NG r A G

Aπ

≈ =

( )2X Q•( ) ( )21

134

3

e A se p s

X Qx Q

Aδ

=⎛ ⎞⎜ ⎟⎝ ⎠

Example:Q2=4 (GeV/c)2

δ< 0 3 A t RHIC ≈ tδ< 0.3A = 200

Xep=10-6 for XeA = 10-3

eA at eRHIC ≈ same parton density as ep at LHC energies!


Explore gluonExplore gluon--dominated matterdominated matter• What is the role of gluons and gluon self-interactions in nucleons

and nuclei? NSAC-2007– The nucleus as a “gluon amplifier”

At high gluon density, gluon recombination should compete

g p

recombination should compete with gluon splitting ⇒ density saturation.

Color glass condensate

• Oomph factor stands up under scrutiny.

• Nuclei greatly extend x reach:xEIC = xHERA/18 for 10+100 GeV, Au


Explore the low energy precision frontierExplore the low energy precision frontierf Preliminary EIC“The task of the physicist is to see through

the appearances down to the underlying, very simple, symmetric reality.”

- S. Weinberg

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC

MS-bar schemeErler and Ramsey-Musolf

Phys. Rev. D72 073003 (2005)

Preliminary - EIC

What are the unseen forces present at the dawn of the Universe but have

S. Weinberg

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC


Phys. Rev. D72 073003 (2005)

the dawn of the Universe but have disappeared from view as the universe evolved? precision electroweak experiments: sin2q

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC


Phys. Rev. D72 073003 (2005)

electroweak experiments: sin2qW , …

Questions for the Universe, Quantum U i HEPAP 2004 NSAC L

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC


Phys. Rev. D72 073003 (2005)Universe, HEPAP, 2004; NSAC Long Range Plan, 2007

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC


Phys. Rev. D72 073003 (2005)

R H lt

0.23

0.24

10-4

10-3

10-2

10-1

1 10 102

103

104

Q (GeV)

sin2 (θ

W)

Z-pole(comb.)

PV DISJLab12 GeV

E-158Møller

QWeak(prop.)APV Cs

NuTeV

Afb

EIC


Phys. Rev. D72 073003 (2005)

R. Holt• 5 GeV polarized e on 50 GeV unpolarized deuteron • ~ 500 fb-1 integrated luminosity

f ll sim lation req ired30

• full simulation requiredRichard Milner MAMI and Beyond

April 1 2009

Lattice QCDLattice QCDLattice QCDLattice QCDJ. Negele


EIC accelerator conceptsEIC accelerator conceptseRHIC ELIC

Peak lumi ~ 2.6 x 1033cm-2s-1 Peak lumi ~ 6 x 1034cm-2s-1

“We recommend the allocation of resources to develop l d d h l l haccelerator and detector technology necessary to lay the

foundation for a polarized Electron-Ion Collider.”NSAC LRP 2007


EIC accelerator R&D is underwayEIC accelerator R&D is underway• Electron beam R&D for ERL based design:• Electron beam R&D for ERL-based design:

– High intensity polarized electron source • Development of large cathode guns with existing current densities ~ 50

2mA/cm2 with good cathode lifetime. – Energy recovery technology for high power beams

• Multicavity cryomodule development; BNL test ERL; loss protection; y y p ; ; p ;instabilities.

– Development of compact recirculation loop magnets• Design build and test a prototype of a small gap magnet and itsDesign, build and test a prototype of a small gap magnet and its

vacuum chamber.– Evaluation of electron-ion beam-beam effects, including the kink instability

and e-beam disruptionand e-beam disruption• Ion beam R&D:

– Polarized 3He production (EBIS) and acceleration– Increasing number of bunches, number of ions/bunch in RHIC

• Cooling:– Cooling of ion beam

33

Cooling of ion beam


High intensity polarized electron High intensity polarized electron source R&Dsource R&Dsource R&Dsource R&D

Electrons follow electrical field lines, but ions have different trajectory. Usually, they tend to damage central area of thetend to damage central area of the cathode.

JLAB data

Laser spot

Cathode Damage grooveRing-like cathodes ?

E. Tsentalovich MIT-Bates


LifetimeLifetimeLifetimeLifetimeAxicon, anode grounded, t~120h Axicon, anode at 1 kV, t~230hLarge spot X1 4 t 60h small spot (center) X17 t 50hLarge spot X1.4, t~60h small spot (center) X17, t~50h

1.5

% 1

QE,

%

0.5

00 10 20 30 40 50

Time, hours


Cathode CoolingCathode Coolinggg

Water inHV

Water out

ManipulatorManipulator

Crystal

LaserCathode


ERL Test FacilityERL Test Facility• test of high current (~ 0.5 A) high brightness ERL operation

e- 15-20 MeVReturn loop

g g p• 5-cell cavity SRF ERL • test of high current beam stability issues

Cryo-moduleCryo-moduleMerger system

• highly flexible lattice• 704 MHz SRF gun test

SRF cavity e-

2.5 MeVStart of commissioning in 2009.

50 kW 703.75 MHzsystem

1 MW 703.75 MHzKlystron

5 ll SRF i5 cell SRF cavityarrived in BNL inMarch 2008 .


Recirculation passesRecirculation passesSeparate recirculation loopsSmall aperture magnetsLow current, low power

eRHICconsumptionMinimized cost

eRHIC

10 GeV 5 mm

5 mm

(20 GeV)

8.1 GeV (16.1 GeV)um

5 mm

5 mm

( )

6.2 GeV (12.2 GeV)

omm

on v

acuu

ham

ber

5 mm4.3 GeV (8.3 GeV)

Co ch

Approved LDRD for the compact magnet development

38

developmentRichard Milner MAMI and Beyond

April 1 2009

EIC central detector: emerging conceptEIC central detector: emerging concept

• 2 “main” components• electron detection in forward direction (theta<400)electron detection in forward direction (theta<40 )• final state detection and hadron identification in proton direction (theta > 1400 ?)

• some low resolution energy measurement for central angles• vertex detection (resolution better than 100 μm)

pl s• plus:• electron detection at very low angles (how?)• detection of “recoiling” neutron and proton (maximumdetection of recoiling neutron and proton (maximum acceptance)

• plus:• luminosity measurement with accuracy of ~ 1%• polarization measurements with accuracy of ~ 1% (both electron and ion !)

39

electron and ion !)Richard Milner MAMI and Beyond

April 1 2009

Open issues/questionsOpen issues/questions• What is the optimal magnetic field configurations for such a detector ?

p qp q

detector ?- simple solenoid most likely NOT sufficient- solenoid plus toroid or solenoid plus dipole ?

• What angular/momentum resolution do we need for the electron ?

Wh t l l ti d d i th h d d t ti ?• What angular resolution do we need in the hadron detection ?• Study of jet physics • e-A Monte-Carlo developmente A Monte Carlo development• Calculation of backgrounds from beam gas events


8 t (f l )

Emerging detector conceptEmerging detector concept8 meters (for scale)

TOF

140 degrees

Offset IP

HCAL

TOF

PbWO4ECAL

Tracking

dipoleRICH

g

RICHHCAL

Needed?

solenoid

41Issues: 1) would need to change (E)TOF with HTCC if 500 MHz operation

2) need add’l Particle Id. (RICH/DIRC) for large angle π/K/p?3) conflict with charm measurements that require low central field?



Interaction Region DesignInteraction Region Design

Present IR design features:No crossing angle at the IP(Blue) ion ring

magnets

(Red) electron beam magnets

Detector integrated dipole: dipole field superimposed on detector solenoid.No parasitic collisions.Round beam collision geometry with

magnets

Detector

Round beam collision geometry with matched sizes of electron and ion beams.Synchrotron radiation emitted by electrons does not hit surfaces in the detector region.gBlue ion ring and electron ring magnets are warm.First quadrupoles (electron beam) are at 3m from the IP3m from the IPYellow ion ring makes 3m vertical excursion.

(Yellow) ion ring magnets(Yellow) ion ring magnets

HERA type half quadrupoleused for proton beam focusing

43

p g


Staging of EICStaging of EIC• Can one consider an initial stage of EIC where

- cost is a fraction of that of full EICit can be realized on a significantly faster timescale than- it can be realized on a significantly faster timescale than

the full EIC? • It must have a strong science case, i.e. it must open up a dramatic new

capabilitycapability. • It should naturally evolve to the full EIC.• Considerations include

l i it 3 1032 2 1- luminosity ~ 3 x 1032 cm-2s-1

- center of mass energy ~ 4 Gev e± on 250 GeV RHIC- polarized nucleon and nuclear beams

• Fortuitously, the ISABELLE tunnel has a region of large diameter near IP2- 2 to 4 GeV ERL in tunnel- eRHIC detector in IP2

• Staging scenario for ELIC as defined above hard for me to see but if thereis one, it should be pursued.


MEeIC @ IP2: up to 2 GeV with RT magnetsMEeIC @ IP2: up to 2 GeV with RT magnetsup to 4 GeV with SC magnets up to 4 GeV with SC magnets

2 x (0.5-0.7) GeV SRF linacs

IP

2 4 passes depending

IP

100 MeV injector2-4 passes, depending of top energy

Stage I -RHIC with ERL inside RHIC tunnel



MEeIC parameters for eMEeIC parameters for e--p collisions (2 GeV option)p collisions (2 GeV option)not cooled pre-cooled high energy coolingnot cooled pre cooled high energy coolingp e p e p e

Energy, GeV 250 2 250 2 250 2Number of bunches 111 111 111Bunch intensity, 1011 2.0 0.31 2.0 0.31 2.0 0.31Bunch charge, nC 32 5 32 5 32 5Normalized emittance, 1e-6 m 95% for p / rms for e 15 37 6 14.7 1.5 3.7m, 95% for p / rms for e

rms emittance, nm 9.4 9.4 3.8 3.8 0.94 0.94beta*, cm 50 50 50 50 50 50rms bunch length, cm 40 1 40 1 40 1beam-beam for p /disruption 1 5e-3 12 3 8e-3 31 0 015 120for e 1.5e-3 12 3.8e-3 31 0.015 120

Peak Luminosity, 1e32, cm-2s-1 0.93 2.3 9.3


Physics at a High Energy Electron Ion

Institute for Nuclear Theory Programs

Collider

October 19-23, 2009

Daniel BoerMarkus DiehlR j V lRaju VenugopalanWerner Vogelsang

Gluons and the quark sea at highGluons and the quark sea at high energies: distributions, polarizations, tomography

Three months in fall 2010

Daniel BoerMarkus DiehlRichard MilnerRaju Venugopalan

48Werner Vogelsang


Electron Ion Collider CollaborationSteering CommitteeSteering Committee• Abhay Deshpande, Stony Brook, RBRC (Co-Chair/Contact person) • Rolf Ent, Jlab • Charles Hyde, ODU/UBP, France

P t J b LBL• Peter Jacobs, LBL • Richard Milner, MIT (Co-Chair/Contact person) • Thomas Ulrich, BNL • Raju Venugopalan, BNL

A tj B ll Jl b

Working Groups and Convenors•ep Physics

• Antje Bruell, JLAB • Ernst Sichterman LBL

International Advisory Committee

• Antje Bruell, Jlab • Werner Vogelsang, BNL

• Ernst Sichterman, LBL • Werner Vogelsang, BNL • Christian Weiss, JLAB

•eA Physics • Vadim Guzey JLAB• Jochen Bartels (DESY)

• Allen Caldwell (MPI, Munich) • Albert De Roeck (CERN) • Walter Henning (ANL)

• Vadim Guzey, JLAB • Dave Morrison, BNL • Thomas Ullrich, BNL • Raju Venugopalan, BNL

•Detector• Walter Henning (ANL) • Dave Hertzog (UIUC) • Xiangdong Ji (U. Maryland) • Robert Klanner (U. Hamburg)

•Detector• Elke Aschenauer, JLAB • Edward Kinney, Colorado • Bernd Surrow, MIT

•Electron Beam Polarimetry( g)• Katsunobu Oide (KEK) • Naohito Saito (KEK) • Uli Wienands (SLAC)

Electron Beam Polarimetry• Wolfgang Lorenzon, Michigan


Report of EIC IAC March 2009Report of EIC IAC March 2009• As proposed by EICC, work out a clear and well-defined matrix of science goals vs.

accelerator performance parameters (and cost). • Distill and appropriately formulate from the range of research opportunities that the• Distill and appropriately formulate from the range of research opportunities that the

EIC provides a short list of the most compelling science objectives (and possibly “golden experiments”) that can convince, and generate support from, the broader science community as represented by NSACscience community as represented by NSAC

• Further develop the schedule including approximate resource-loading, to provide a timeline for major decisions (including, if at all possible, site decision), technical developments and (staged) realizationdevelopments, and (staged) realization

• In particular, strive for a timeline (under reasonable assumptions) that provides for data taking before 2020A b i i t t t ti it i t k t d t il d d h i• An obvious important near-term activity is to work out a detailed and comprehensive R&D plan. The proposed common effort between BNL and JLab should focus, to a substantial extent, on R&D for technologies needed for both facility conceptsIt ld b d i bl f th EICAC t d t il d l t th t• It would be desirable for the EICAC to see a detailed common plan at the next meeting with deliverables & resources needed to reach a buildable design for the LRP.


50

SummarySummary• The Electron-Ion Collider is the next generation accelerator concept for the

study of QCD in the U.S. In E rope LHeC as a f t re e ol tion for CERN and ENC@FAIR are nder• In Europe, LHeC as a future evolution for CERN and ENC@FAIR are under discussion.

• It is essential to lay the foundations for the next Long Range Plan Exercise in ~ 2013 2013.

- It will be necessary to broaden and deepen the science case.- Strong, international support is required.

It is highly desirable to have a single EIC accelerator design by- It is highly desirable to have a single EIC accelerator design by ~ 2012.

• Study of the staged eRHIC scenario is getting underway.&• R&D on the accelerator and detector must have a high priority.

• While the path to the full EIC is uncertain, considerable progress has been made by a determined group of highly motivated people.W l k f d h j i ENC/EIC i GSI G• We look forward to the joint ENC/EIC meeting at GSI, Germany on May 28,29, 30.


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